fs/ceph/mon_client.c

   1 #include "ceph_debug.h"
   2
   3 #include <linux/types.h>
   4 #include <linux/slab.h>
   5 #include <linux/random.h>
   6 #include <linux/sched.h>
   7
   8 #include "mon_client.h"
   9 #include "super.h"
  10 #include "auth.h"
  11 #include "decode.h"
  12
  13 /*
  14  * Interact with Ceph monitor cluster.  Handle requests for new map
  15  * versions, and periodically resend as needed.  Also implement
  16  * statfs() and umount().
  17  *
  18  * A small cluster of Ceph "monitors" are responsible for managing critical
  19  * cluster configuration and state information.  An odd number (e.g., 3, 5)
  20  * of cmon daemons use a modified version of the Paxos part-time parliament
  21  * algorithm to manage the MDS map (mds cluster membership), OSD map, and
  22  * list of clients who have mounted the file system.
  23  *
  24  * We maintain an open, active session with a monitor at all times in order to
  25  * receive timely MDSMap updates.  We periodically send a keepalive byte on the
  26  * TCP socket to ensure we detect a failure.  If the connection does break, we
  27  * randomly hunt for a new monitor.  Once the connection is reestablished, we
  28  * resend any outstanding requests.
  29  */
  30
  31 const static struct ceph_connection_operations mon_con_ops;
  32
  33 static int __validate_auth(struct ceph_mon_client *monc);
  34
  35 /*
  36  * Decode a monmap blob (e.g., during mount).
  37  */
  38 struct ceph_monmap *ceph_monmap_decode(void *p, void *end)
  39 {
  40         struct ceph_monmap *m = NULL;
  41         int i, err = -EINVAL;
  42         struct ceph_fsid fsid;
  43         u32 epoch, num_mon;
  44         u16 version;
  45         u32 len;
  46
  47         ceph_decode_32_safe(&p, end, len, bad);
  48         ceph_decode_need(&p, end, len, bad);
  49
  50         dout("monmap_decode %p %p len %d\n", p, end, (int)(end-p));
  51
  52         ceph_decode_16_safe(&p, end, version, bad);
  53
  54         ceph_decode_need(&p, end, sizeof(fsid) + 2*sizeof(u32), bad);
  55         ceph_decode_copy(&p, &fsid, sizeof(fsid));
  56         epoch = ceph_decode_32(&p);
  57
  58         num_mon = ceph_decode_32(&p);
  59         ceph_decode_need(&p, end, num_mon*sizeof(m->mon_inst[0]), bad);
  60
  61         if (num_mon >= CEPH_MAX_MON)
  62                 goto bad;
  63         m = kmalloc(sizeof(*m) + sizeof(m->mon_inst[0])*num_mon, GFP_NOFS);
  64         if (m == NULL)
  65                 return ERR_PTR(-ENOMEM);
  66         m->fsid = fsid;
  67         m->epoch = epoch;
  68         m->num_mon = num_mon;
  69         ceph_decode_copy(&p, m->mon_inst, num_mon*sizeof(m->mon_inst[0]));
  70         for (i = 0; i < num_mon; i++)
  71                 ceph_decode_addr(&m->mon_inst[i].addr);
  72
  73         dout("monmap_decode epoch %d, num_mon %d\n", m->epoch,
  74              m->num_mon);
  75         for (i = 0; i < m->num_mon; i++)
  76                 dout("monmap_decode  mon%d is %s\n", i,
  77                      pr_addr(&m->mon_inst[i].addr.in_addr));
  78         return m;
  79
  80 bad:
  81         dout("monmap_decode failed with %d\n", err);
  82         kfree(m);
  83         return ERR_PTR(err);
  84 }
  85
  86 /*
  87  * return true if *addr is included in the monmap.
  88  */
  89 int ceph_monmap_contains(struct ceph_monmap *m, struct ceph_entity_addr *addr)
  90 {
  91         int i;
  92
  93         for (i = 0; i < m->num_mon; i++)
  94                 if (memcmp(addr, &m->mon_inst[i].addr, sizeof(*addr)) == 0)
  95                         return 1;
  96         return 0;
  97 }
  98
  99 /*
 100  * Send an auth request.
 101  */
 102 static void __send_prepared_auth_request(struct ceph_mon_client *monc, int len)
 103 {
 104         monc->pending_auth = 1;
 105         monc->m_auth->front.iov_len = len;
 106         monc->m_auth->hdr.front_len = cpu_to_le32(len);
 107         ceph_msg_get(monc->m_auth);  /* keep our ref */
 108         ceph_con_send(monc->con, monc->m_auth);
 109 }
 110
 111 /*
 112  * Close monitor session, if any.
 113  */
 114 static void __close_session(struct ceph_mon_client *monc)
 115 {
 116         if (monc->con) {
 117                 dout("__close_session closing mon%d\n", monc->cur_mon);
 118                 ceph_con_revoke(monc->con, monc->m_auth);
 119                 ceph_con_close(monc->con);
 120                 monc->cur_mon = -1;
 121                 monc->pending_auth = 0;
 122                 ceph_auth_reset(monc->auth);
 123         }
 124 }
 125
 126 /*
 127  * Open a session with a (new) monitor.
 128  */
 129 static int __open_session(struct ceph_mon_client *monc)
 130 {
 131         char r;
 132         int ret;
 133
 134         if (monc->cur_mon < 0) {
 135                 get_random_bytes(&r, 1);
 136                 monc->cur_mon = r % monc->monmap->num_mon;
 137                 dout("open_session num=%d r=%d -> mon%d\n",
 138                      monc->monmap->num_mon, r, monc->cur_mon);
 139                 monc->sub_sent = 0;
 140                 monc->sub_renew_after = jiffies;  /* i.e., expired */
 141                 monc->want_next_osdmap = !!monc->want_next_osdmap;
 142
 143                 dout("open_session mon%d opening\n", monc->cur_mon);
 144                 monc->con->peer_name.type = CEPH_ENTITY_TYPE_MON;
 145                 monc->con->peer_name.num = cpu_to_le64(monc->cur_mon);
 146                 ceph_con_open(monc->con,
 147                               &monc->monmap->mon_inst[monc->cur_mon].addr);
 148
 149                 /* initiatiate authentication handshake */
 150                 ret = ceph_auth_build_hello(monc->auth,
 151                                             monc->m_auth->front.iov_base,
 152                                             monc->m_auth->front_max);
 153                 __send_prepared_auth_request(monc, ret);
 154         } else {
 155                 dout("open_session mon%d already open\n", monc->cur_mon);
 156         }
 157         return 0;
 158 }
 159
 160 static bool __sub_expired(struct ceph_mon_client *monc)
 161 {
 162         return time_after_eq(jiffies, monc->sub_renew_after);
 163 }
 164
 165 /*
 166  * Reschedule delayed work timer.
 167  */
 168 static void __schedule_delayed(struct ceph_mon_client *monc)
 169 {
 170         unsigned delay;
 171
 172         if (monc->cur_mon < 0 || __sub_expired(monc))
 173                 delay = 10 * HZ;
 174         else
 175                 delay = 20 * HZ;
 176         dout("__schedule_delayed after %u\n", delay);
 177         schedule_delayed_work(&monc->delayed_work, delay);
 178 }
 179
 180 /*
 181  * Send subscribe request for mdsmap and/or osdmap.
 182  */
 183 static void __send_subscribe(struct ceph_mon_client *monc)
 184 {
 185         dout("__send_subscribe sub_sent=%u exp=%u want_osd=%d\n",
 186              (unsigned)monc->sub_sent, __sub_expired(monc),
 187              monc->want_next_osdmap);
 188         if ((__sub_expired(monc) && !monc->sub_sent) ||
 189             monc->want_next_osdmap == 1) {
 190                 struct ceph_msg *msg;
 191                 struct ceph_mon_subscribe_item *i;
 192                 void *p, *end;
 193
 194                 msg = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE, 96, 0, 0, NULL);
 195                 if (!msg)
 196                         return;
 197
 198                 p = msg->front.iov_base;
 199                 end = p + msg->front.iov_len;
 200
 201                 dout("__send_subscribe to 'mdsmap' %u+\n",
 202                      (unsigned)monc->have_mdsmap);
 203                 if (monc->want_next_osdmap) {
 204                         dout("__send_subscribe to 'osdmap' %u\n",
 205                              (unsigned)monc->have_osdmap);
 206                         ceph_encode_32(&p, 3);
 207                         ceph_encode_string(&p, end, "osdmap", 6);
 208                         i = p;
 209                         i->have = cpu_to_le64(monc->have_osdmap);
 210                         i->onetime = 1;
 211                         p += sizeof(*i);
 212                         monc->want_next_osdmap = 2;  /* requested */
 213                 } else {
 214                         ceph_encode_32(&p, 2);
 215                 }
 216                 ceph_encode_string(&p, end, "mdsmap", 6);
 217                 i = p;
 218                 i->have = cpu_to_le64(monc->have_mdsmap);
 219                 i->onetime = 0;
 220                 p += sizeof(*i);
 221                 ceph_encode_string(&p, end, "monmap", 6);
 222                 i = p;
 223                 i->have = 0;
 224                 i->onetime = 0;
 225                 p += sizeof(*i);
 226
 227                 msg->front.iov_len = p - msg->front.iov_base;
 228                 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
 229                 ceph_con_send(monc->con, msg);
 230
 231                 monc->sub_sent = jiffies | 1;  /* never 0 */
 232         }
 233 }
 234
 235 static void handle_subscribe_ack(struct ceph_mon_client *monc,
 236                                  struct ceph_msg *msg)
 237 {
 238         unsigned seconds;
 239         struct ceph_mon_subscribe_ack *h = msg->front.iov_base;
 240
 241         if (msg->front.iov_len < sizeof(*h))
 242                 goto bad;
 243         seconds = le32_to_cpu(h->duration);
 244
 245         mutex_lock(&monc->mutex);
 246         if (monc->hunting) {
 247                 pr_info("mon%d %s session established\n",
 248                         monc->cur_mon, pr_addr(&monc->con->peer_addr.in_addr));
 249                 monc->hunting = false;
 250         }
 251         dout("handle_subscribe_ack after %d seconds\n", seconds);
 252         monc->sub_renew_after = monc->sub_sent + (seconds >> 1)*HZ - 1;
 253         monc->sub_sent = 0;
 254         mutex_unlock(&monc->mutex);
 255         return;
 256 bad:
 257         pr_err("got corrupt subscribe-ack msg\n");
 258         ceph_msg_dump(msg);
 259 }
 260
 261 /*
 262  * Keep track of which maps we have
 263  */
 264 int ceph_monc_got_mdsmap(struct ceph_mon_client *monc, u32 got)
 265 {
 266         mutex_lock(&monc->mutex);
 267         monc->have_mdsmap = got;
 268         mutex_unlock(&monc->mutex);
 269         return 0;
 270 }
 271
 272 int ceph_monc_got_osdmap(struct ceph_mon_client *monc, u32 got)
 273 {
 274         mutex_lock(&monc->mutex);
 275         monc->have_osdmap = got;
 276         monc->want_next_osdmap = 0;
 277         mutex_unlock(&monc->mutex);
 278         return 0;
 279 }
 280
 281 /*
 282  * Register interest in the next osdmap
 283  */
 284 void ceph_monc_request_next_osdmap(struct ceph_mon_client *monc)
 285 {
 286         dout("request_next_osdmap have %u\n", monc->have_osdmap);
 287         mutex_lock(&monc->mutex);
 288         if (!monc->want_next_osdmap)
 289                 monc->want_next_osdmap = 1;
 290         if (monc->want_next_osdmap < 2)
 291                 __send_subscribe(monc);
 292         mutex_unlock(&monc->mutex);
 293 }
 294
 295 /*
 296  *
 297  */
 298 int ceph_monc_open_session(struct ceph_mon_client *monc)
 299 {
 300         if (!monc->con) {
 301                 monc->con = kmalloc(sizeof(*monc->con), GFP_KERNEL);
 302                 if (!monc->con)
 303                         return -ENOMEM;
 304                 ceph_con_init(monc->client->msgr, monc->con);
 305                 monc->con->private = monc;
 306                 monc->con->ops = &mon_con_ops;
 307         }
 308
 309         mutex_lock(&monc->mutex);
 310         __open_session(monc);
 311         __schedule_delayed(monc);
 312         mutex_unlock(&monc->mutex);
 313         return 0;
 314 }
 315
 316 /*
 317  * The monitor responds with mount ack indicate mount success.  The
 318  * included client ticket allows the client to talk to MDSs and OSDs.
 319  */
 320 static void ceph_monc_handle_map(struct ceph_mon_client *monc,
 321                                  struct ceph_msg *msg)
 322 {
 323         struct ceph_client *client = monc->client;
 324         struct ceph_monmap *monmap = NULL, *old = monc->monmap;
 325         void *p, *end;
 326
 327         mutex_lock(&monc->mutex);
 328
 329         dout("handle_monmap\n");
 330         p = msg->front.iov_base;
 331         end = p + msg->front.iov_len;
 332
 333         monmap = ceph_monmap_decode(p, end);
 334         if (IS_ERR(monmap)) {
 335                 pr_err("problem decoding monmap, %d\n",
 336                        (int)PTR_ERR(monmap));
 337                 goto out;
 338         }
 339
 340         if (ceph_check_fsid(monc->client, &monmap->fsid) < 0) {
 341                 kfree(monmap);
 342                 goto out;
 343         }
 344
 345         client->monc.monmap = monmap;
 346         kfree(old);
 347
 348 out:
 349         mutex_unlock(&monc->mutex);
 350         wake_up(&client->auth_wq);
 351 }
 352
 353 /*
 354  * statfs
 355  */
 356 static struct ceph_mon_statfs_request *__lookup_statfs(
 357         struct ceph_mon_client *monc, u64 tid)
 358 {
 359         struct ceph_mon_statfs_request *req;
 360         struct rb_node *n = monc->statfs_request_tree.rb_node;
 361
 362         while (n) {
 363                 req = rb_entry(n, struct ceph_mon_statfs_request, node);
 364                 if (tid < req->tid)
 365                         n = n->rb_left;
 366                 else if (tid > req->tid)
 367                         n = n->rb_right;
 368                 else
 369                         return req;
 370         }
 371         return NULL;
 372 }
 373
 374 static void __insert_statfs(struct ceph_mon_client *monc,
 375                             struct ceph_mon_statfs_request *new)
 376 {
 377         struct rb_node **p = &monc->statfs_request_tree.rb_node;
 378         struct rb_node *parent = NULL;
 379         struct ceph_mon_statfs_request *req = NULL;
 380
 381         while (*p) {
 382                 parent = *p;
 383                 req = rb_entry(parent, struct ceph_mon_statfs_request, node);
 384                 if (new->tid < req->tid)
 385                         p = &(*p)->rb_left;
 386                 else if (new->tid > req->tid)
 387                         p = &(*p)->rb_right;
 388                 else
 389                         BUG();
 390         }
 391
 392         rb_link_node(&new->node, parent, p);
 393         rb_insert_color(&new->node, &monc->statfs_request_tree);
 394 }
 395
 396 static void handle_statfs_reply(struct ceph_mon_client *monc,
 397                                 struct ceph_msg *msg)
 398 {
 399         struct ceph_mon_statfs_request *req;
 400         struct ceph_mon_statfs_reply *reply = msg->front.iov_base;
 401         u64 tid;
 402
 403         if (msg->front.iov_len != sizeof(*reply))
 404                 goto bad;
 405         tid = le64_to_cpu(msg->hdr.tid);
 406         dout("handle_statfs_reply %p tid %llu\n", msg, tid);
 407
 408         mutex_lock(&monc->mutex);
 409         req = __lookup_statfs(monc, tid);
 410         if (req) {
 411                 *req->buf = reply->st;
 412                 req->result = 0;
 413         }
 414         mutex_unlock(&monc->mutex);
 415         if (req)
 416                 complete(&req->completion);
 417         return;
 418
 419 bad:
 420         pr_err("corrupt statfs reply, no tid\n");
 421         ceph_msg_dump(msg);
 422 }
 423
 424 /*
 425  * (re)send a statfs request
 426  */
 427 static int send_statfs(struct ceph_mon_client *monc,
 428                        struct ceph_mon_statfs_request *req)
 429 {
 430         struct ceph_msg *msg;
 431         struct ceph_mon_statfs *h;
 432
 433         dout("send_statfs tid %llu\n", req->tid);
 434         msg = ceph_msg_new(CEPH_MSG_STATFS, sizeof(*h), 0, 0, NULL);
 435         if (IS_ERR(msg))
 436                 return PTR_ERR(msg);
 437         req->request = msg;
 438         msg->hdr.tid = cpu_to_le64(req->tid);
 439         h = msg->front.iov_base;
 440         h->monhdr.have_version = 0;
 441         h->monhdr.session_mon = cpu_to_le16(-1);
 442         h->monhdr.session_mon_tid = 0;
 443         h->fsid = monc->monmap->fsid;
 444         ceph_con_send(monc->con, msg);
 445         return 0;
 446 }
 447
 448 /*
 449  * Do a synchronous statfs().
 450  */
 451 int ceph_monc_do_statfs(struct ceph_mon_client *monc, struct ceph_statfs *buf)
 452 {
 453         struct ceph_mon_statfs_request req;
 454         int err;
 455
 456         req.buf = buf;
 457         init_completion(&req.completion);
 458
 459         /* allocate memory for reply */
 460         err = ceph_msgpool_resv(&monc->msgpool_statfs_reply, 1);
 461         if (err)
 462                 return err;
 463
 464         /* register request */
 465         mutex_lock(&monc->mutex);
 466         req.tid = ++monc->last_tid;
 467         req.last_attempt = jiffies;
 468         req.delay = BASE_DELAY_INTERVAL;
 469         __insert_statfs(monc, &req);
 470         monc->num_statfs_requests++;
 471         mutex_unlock(&monc->mutex);
 472
 473         /* send request and wait */
 474         err = send_statfs(monc, &req);
 475         if (!err)
 476                 err = wait_for_completion_interruptible(&req.completion);
 477
 478         mutex_lock(&monc->mutex);
 479         rb_erase(&req.node, &monc->statfs_request_tree);
 480         monc->num_statfs_requests--;
 481         ceph_msgpool_resv(&monc->msgpool_statfs_reply, -1);
 482         mutex_unlock(&monc->mutex);
 483
 484         if (!err)
 485                 err = req.result;
 486         return err;
 487 }
 488
 489 /*
 490  * Resend pending statfs requests.
 491  */
 492 static void __resend_statfs(struct ceph_mon_client *monc)
 493 {
 494         struct ceph_mon_statfs_request *req;
 495         struct rb_node *p;
 496
 497         for (p = rb_first(&monc->statfs_request_tree); p; p = rb_next(p)) {
 498                 req = rb_entry(p, struct ceph_mon_statfs_request, node);
 499                 send_statfs(monc, req);
 500         }
 501 }
 502
 503 /*
 504  * Delayed work.  If we haven't mounted yet, retry.  Otherwise,
 505  * renew/retry subscription as needed (in case it is timing out, or we
 506  * got an ENOMEM).  And keep the monitor connection alive.
 507  */
 508 static void delayed_work(struct work_struct *work)
 509 {
 510         struct ceph_mon_client *monc =
 511                 container_of(work, struct ceph_mon_client, delayed_work.work);
 512
 513         dout("monc delayed_work\n");
 514         mutex_lock(&monc->mutex);
 515         if (monc->hunting) {
 516                 __close_session(monc);
 517                 __open_session(monc);  /* continue hunting */
 518         } else {
 519                 ceph_con_keepalive(monc->con);
 520
 521                 __validate_auth(monc);
 522
 523                 if (monc->auth->ops->is_authenticated(monc->auth))
 524                         __send_subscribe(monc);
 525         }
 526         __schedule_delayed(monc);
 527         mutex_unlock(&monc->mutex);
 528 }
 529
 530 /*
 531  * On startup, we build a temporary monmap populated with the IPs
 532  * provided by mount(2).
 533  */
 534 static int build_initial_monmap(struct ceph_mon_client *monc)
 535 {
 536         struct ceph_mount_args *args = monc->client->mount_args;
 537         struct ceph_entity_addr *mon_addr = args->mon_addr;
 538         int num_mon = args->num_mon;
 539         int i;
 540
 541         /* build initial monmap */
 542         monc->monmap = kzalloc(sizeof(*monc->monmap) +
 543                                num_mon*sizeof(monc->monmap->mon_inst[0]),
 544                                GFP_KERNEL);
 545         if (!monc->monmap)
 546                 return -ENOMEM;
 547         for (i = 0; i < num_mon; i++) {
 548                 monc->monmap->mon_inst[i].addr = mon_addr[i];
 549                 monc->monmap->mon_inst[i].addr.nonce = 0;
 550                 monc->monmap->mon_inst[i].name.type =
 551                         CEPH_ENTITY_TYPE_MON;
 552                 monc->monmap->mon_inst[i].name.num = cpu_to_le64(i);
 553         }
 554         monc->monmap->num_mon = num_mon;
 555         monc->have_fsid = false;
 556
 557         /* release addr memory */
 558         kfree(args->mon_addr);
 559         args->mon_addr = NULL;
 560         args->num_mon = 0;
 561         return 0;
 562 }
 563
 564 int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl)
 565 {
 566         int err = 0;
 567
 568         dout("init\n");
 569         memset(monc, 0, sizeof(*monc));
 570         monc->client = cl;
 571         monc->monmap = NULL;
 572         mutex_init(&monc->mutex);
 573
 574         err = build_initial_monmap(monc);
 575         if (err)
 576                 goto out;
 577
 578         monc->con = NULL;
 579
 580         /* authentication */
 581         monc->auth = ceph_auth_init(cl->mount_args->name,
 582                                     cl->mount_args->secret);
 583         if (IS_ERR(monc->auth))
 584                 return PTR_ERR(monc->auth);
 585         monc->auth->want_keys =
 586                 CEPH_ENTITY_TYPE_AUTH | CEPH_ENTITY_TYPE_MON |
 587                 CEPH_ENTITY_TYPE_OSD | CEPH_ENTITY_TYPE_MDS;
 588
 589         /* msg pools */
 590         err = ceph_msgpool_init(&monc->msgpool_subscribe_ack,
 591                                sizeof(struct ceph_mon_subscribe_ack), 1, false);
 592         if (err < 0)
 593                 goto out_monmap;
 594         err = ceph_msgpool_init(&monc->msgpool_statfs_reply,
 595                                 sizeof(struct ceph_mon_statfs_reply), 0, false);
 596         if (err < 0)
 597                 goto out_pool1;
 598         err = ceph_msgpool_init(&monc->msgpool_auth_reply, 4096, 1, false);
 599         if (err < 0)
 600                 goto out_pool2;
 601
 602         monc->m_auth = ceph_msg_new(CEPH_MSG_AUTH, 4096, 0, 0, NULL);
 603         monc->pending_auth = 0;
 604         if (IS_ERR(monc->m_auth)) {
 605                 err = PTR_ERR(monc->m_auth);
 606                 monc->m_auth = NULL;
 607                 goto out_pool3;
 608         }
 609
 610         monc->cur_mon = -1;
 611         monc->hunting = true;
 612         monc->sub_renew_after = jiffies;
 613         monc->sub_sent = 0;
 614
 615         INIT_DELAYED_WORK(&monc->delayed_work, delayed_work);
 616         monc->statfs_request_tree = RB_ROOT;
 617         monc->num_statfs_requests = 0;
 618         monc->last_tid = 0;
 619
 620         monc->have_mdsmap = 0;
 621         monc->have_osdmap = 0;
 622         monc->want_next_osdmap = 1;
 623         return 0;
 624
 625 out_pool3:
 626         ceph_msgpool_destroy(&monc->msgpool_auth_reply);
 627 out_pool2:
 628         ceph_msgpool_destroy(&monc->msgpool_subscribe_ack);
 629 out_pool1:
 630         ceph_msgpool_destroy(&monc->msgpool_statfs_reply);
 631 out_monmap:
 632         kfree(monc->monmap);
 633 out:
 634         return err;
 635 }
 636
 637 void ceph_monc_stop(struct ceph_mon_client *monc)
 638 {
 639         dout("stop\n");
 640         cancel_delayed_work_sync(&monc->delayed_work);
 641
 642         mutex_lock(&monc->mutex);
 643         __close_session(monc);
 644         if (monc->con) {
 645                 monc->con->private = NULL;
 646                 monc->con->ops->put(monc->con);
 647                 monc->con = NULL;
 648         }
 649         mutex_unlock(&monc->mutex);
 650
 651         ceph_auth_destroy(monc->auth);
 652
 653         ceph_msg_put(monc->m_auth);
 654         ceph_msgpool_destroy(&monc->msgpool_subscribe_ack);
 655         ceph_msgpool_destroy(&monc->msgpool_statfs_reply);
 656         ceph_msgpool_destroy(&monc->msgpool_auth_reply);
 657
 658         kfree(monc->monmap);
 659 }
 660
 661 static void handle_auth_reply(struct ceph_mon_client *monc,
 662                               struct ceph_msg *msg)
 663 {
 664         int ret;
 665
 666         mutex_lock(&monc->mutex);
 667         monc->pending_auth = 0;
 668         ret = ceph_handle_auth_reply(monc->auth, msg->front.iov_base,
 669                                      msg->front.iov_len,
 670                                      monc->m_auth->front.iov_base,
 671                                      monc->m_auth->front_max);
 672         if (ret < 0) {
 673                 monc->client->auth_err = ret;
 674                 wake_up(&monc->client->auth_wq);
 675         } else if (ret > 0) {
 676                 __send_prepared_auth_request(monc, ret);
 677         } else if (monc->auth->ops->is_authenticated(monc->auth)) {
 678                 dout("authenticated, starting session\n");
 679
 680                 monc->client->msgr->inst.name.type = CEPH_ENTITY_TYPE_CLIENT;
 681                 monc->client->msgr->inst.name.num = monc->auth->global_id;
 682
 683                 __send_subscribe(monc);
 684                 __resend_statfs(monc);
 685         }
 686         mutex_unlock(&monc->mutex);
 687 }
 688
 689 static int __validate_auth(struct ceph_mon_client *monc)
 690 {
 691         int ret;
 692
 693         if (monc->pending_auth)
 694                 return 0;
 695
 696         ret = ceph_build_auth(monc->auth, monc->m_auth->front.iov_base,
 697                               monc->m_auth->front_max);
 698         if (ret <= 0)
 699                 return ret; /* either an error, or no need to authenticate */
 700         __send_prepared_auth_request(monc, ret);
 701         return 0;
 702 }
 703
 704 int ceph_monc_validate_auth(struct ceph_mon_client *monc)
 705 {
 706         int ret;
 707
 708         mutex_lock(&monc->mutex);
 709         ret = __validate_auth(monc);
 710         mutex_unlock(&monc->mutex);
 711         return ret;
 712 }
 713
 714 /*
 715  * handle incoming message
 716  */
 717 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
 718 {
 719         struct ceph_mon_client *monc = con->private;
 720         int type = le16_to_cpu(msg->hdr.type);
 721
 722         if (!monc)
 723                 return;
 724
 725         switch (type) {
 726         case CEPH_MSG_AUTH_REPLY:
 727                 handle_auth_reply(monc, msg);
 728                 break;
 729
 730         case CEPH_MSG_MON_SUBSCRIBE_ACK:
 731                 handle_subscribe_ack(monc, msg);
 732                 break;
 733
 734         case CEPH_MSG_STATFS_REPLY:
 735                 handle_statfs_reply(monc, msg);
 736                 break;
 737
 738         case CEPH_MSG_MON_MAP:
 739                 ceph_monc_handle_map(monc, msg);
 740                 break;
 741
 742         case CEPH_MSG_MDS_MAP:
 743                 ceph_mdsc_handle_map(&monc->client->mdsc, msg);
 744                 break;
 745
 746         case CEPH_MSG_OSD_MAP:
 747                 ceph_osdc_handle_map(&monc->client->osdc, msg);
 748                 break;
 749
 750         default:
 751                 pr_err("received unknown message type %d %s\n", type,
 752                        ceph_msg_type_name(type));
 753         }
 754         ceph_msg_put(msg);
 755 }
 756
 757 /*
 758  * Allocate memory for incoming message
 759  */
 760 static struct ceph_msg *mon_alloc_msg(struct ceph_connection *con,
 761                                       struct ceph_msg_header *hdr,
 762                                       int *skip)
 763 {
 764         struct ceph_mon_client *monc = con->private;
 765         int type = le16_to_cpu(hdr->type);
 766         int front_len = le32_to_cpu(hdr->front_len);
 767         struct ceph_msg *m = NULL;
 768
 769         *skip = 0;
 770
 771         switch (type) {
 772         case CEPH_MSG_MON_SUBSCRIBE_ACK:
 773                 m = ceph_msgpool_get(&monc->msgpool_subscribe_ack, front_len);
 774                 break;
 775         case CEPH_MSG_STATFS_REPLY:
 776                 m = ceph_msgpool_get(&monc->msgpool_statfs_reply, front_len);
 777                 break;
 778         case CEPH_MSG_AUTH_REPLY:
 779                 m = ceph_msgpool_get(&monc->msgpool_auth_reply, front_len);
 780                 break;
 781         case CEPH_MSG_MON_MAP:
 782         case CEPH_MSG_MDS_MAP:
 783         case CEPH_MSG_OSD_MAP:
 784                 m = ceph_msg_new(type, front_len, 0, 0, NULL);
 785                 break;
 786         }
 787
 788         if (!m) {
 789                 pr_info("alloc_msg unknown type %d\n", type);
 790                 *skip = 1;
 791         }
 792         return m;
 793 }
 794
 795 /*
 796  * If the monitor connection resets, pick a new monitor and resubmit
 797  * any pending requests.
 798  */
 799 static void mon_fault(struct ceph_connection *con)
 800 {
 801         struct ceph_mon_client *monc = con->private;
 802
 803         if (!monc)
 804                 return;
 805
 806         dout("mon_fault\n");
 807         mutex_lock(&monc->mutex);
 808         if (!con->private)
 809                 goto out;
 810
 811         if (monc->con && !monc->hunting)
 812                 pr_info("mon%d %s session lost, "
 813                         "hunting for new mon\n", monc->cur_mon,
 814                         pr_addr(&monc->con->peer_addr.in_addr));
 815
 816         __close_session(monc);
 817         if (!monc->hunting) {
 818                 /* start hunting */
 819                 monc->hunting = true;
 820                 __open_session(monc);
 821         } else {
 822                 /* already hunting, let's wait a bit */
 823                 __schedule_delayed(monc);
 824         }
 825 out:
 826         mutex_unlock(&monc->mutex);
 827 }
 828
 829 const static struct ceph_connection_operations mon_con_ops = {
 830         .get = ceph_con_get,
 831         .put = ceph_con_put,
 832         .dispatch = dispatch,
 833         .fault = mon_fault,
 834         .alloc_msg = mon_alloc_msg,
 835 };